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My Message to the WorldWhat are Protists? Protists are single and multicellular organisms that are plant-like, animal-like and fungi-like. They evolved from bacteria and represent the intermediate step in the evolution of the other three kingdoms. There are 12 phyla in this kingdom, most of which live in water. Protists are eukaryotic, predominantly microscopic organisms. They may share certain morphological and physiological characteristics with animals or plants, or both. The protists comprise what have traditionally been called protozoa, algae, and lower fungi. From the time of Aristotle, near the end of the 4th century BC, until well after the middle of the 20th century, the entire biotic world was generally considered divisible into just two great kingdoms, the plants and the animals. The separation was based on the assumption that plants are pigmented (basically green), nonmotile (most commonly from being rooted in the soil, photosynthetic and therefore capable solely of self-contained (autotrophic) nutrition, and unique in possessing cellulosic walls around their cells. By contrast, animals are without photosynthetic pigments (colourless), actively motile, nutritionally phagotrophic (and therefore required to capture or absorb important nutrients), and without walls around their cells.Sign My Guestbook
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